selector-required-ref.html

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<!DOCTYPE html>

<html>

	<head>

		<title>CSS level4 Selector :required and :optional</title>

		<link rel="author" title="LEE YUN HEE" href="mailto:zzirasi@gmail.com">

		<style>

			input {border:3px solid green;}

		</style>

	</head>

	<body>

<p>

			You should see a green input box.

		</p>

<p>

        	<input>

        </p>

<p>

        	<input>

        </p>

	</body>

</html>